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  • Bitmask Handling, part 4: Left-shift and right-shift

    Quick installment this time. Left-shift and right-shift operators. Left-shift and right-shift are integral to binary mathematical operations as they have two important qualities: Left-shifting a bitmask once multiplies by two. Right-shifting once divides by two. For example:  0011 (base 2) = 1 + 2 = 33 << 1 = 0110 (base 2) = 4 ...
    Posted to Adam Machanic (Weblog) by Adam Machanic on February 10, 2005
  • Bitmask Handling, part 3: Logical operators

    It's been longer than I hoped since my last installment on bitmask / big number handling. Life caught up with me and I've had many thankless tasks to catch up on. But that's over now and I'm back to the general slacking that typifies my days, so welcome to Part 3, handling logical operators. I'll be discussing four operators in this post. AND, ...
    Posted to Adam Machanic (Weblog) by Adam Machanic on February 4, 2005
  • Bitmask Handling, part 2: Bitmask reconstitution

    Posting the first part of my series on bitmasks (yes, this is now officially a series) taught me a lot about my readers: You don't care about handling bitmasks in the database. And I respect you for that! I'm overjoyed, as a matter of fact! That article has received the least hits of anything I've posted in this blog to date. So good for you ...
    Posted to Adam Machanic (Weblog) by Adam Machanic on January 28, 2005
  • Correction on bitmask handling

    In the article on handling bitmasks I posted the other day, I made a fatal error in the splitBitmask function. The function treated the low byte as the first byte, instead of the high byte. Therefore:  0x01 != 0x0001 ... and that is not good! So here's a corrected version that fixes the problem:  CREATE FUNCTION ...
    Posted to Adam Machanic (Weblog) by Adam Machanic on January 26, 2005
  • Dealing with very large bitmasks

    Continuing in my series of things you should probably not do in SQL Server but sometimes have to, I'm going to do a few posts on dealing with very large bitmasks. Let me first state my utter hatered of bitmasks in databases. I think they're annoying, make the system difficult to understand, and whether or not they violate the First Normal ...
    Posted to Adam Machanic (Weblog) by Adam Machanic on January 25, 2005
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